Carbureter.



w. M. SNY'DER.

CARBURETER.

APPLICATION FILED ,MYZTI |914.

1 1 97,407. Patented Sept. 5, 1916.

W .if 1 l' INVENTOR MW 7f-' WITNESSES UNITED STATES PATENT OFFICE.

WILLIAM M. SNYDER, OF NEWARK, NEW JERSEY, ASSIGOB TO 'BREEZE CARBURETER COMPANY, 0F NEWARK, NEW JERSEY, A. CORPORATION 0F NEW JERSEY.

CARBURETER.

Specication of Letters Patent.

Patented Sept. 5, 1916.

Application led Hay 27, 1914. Serial No. 841,252.

To all whom it may cormcrn:

Be it known that I, WiLLiAM M. SNYDER, a citizen of the United States, and a resident of Newark, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Carbureters, of which the following is a specification.

This invention relates to a carbureter for vaporizing the fuel of internal combustion engines and for other purposes, the carbureter having an air passage and a fuel inlet nozzle, the nozzle having means for regulating the quantity of fuel it delivers, in relation to different positions of a throttle which regulates the passage of the mixture from the carbureter.

The invention relates further to a carbureter of this kind which has means for adjusting the relative' positions of the throttle and the valve of the fuel inlet so that a predeterlnined amount of fuel will be available when the throttle is open, or shut, or in an intermediate position.

The invention also has reference to a carbureter in which the connection between the throttle and fuel valve is inside the air passage of the carbureter and thus protected from damage by knocking or strains accidentally caused in making repairs and the like, the parts also being less apt to be interfered with in their operation by reason of dirt and dust.

An object of the invention is to provide a. carbureter in which the high-speed gas, so called, is limited in its adjustment, so that the valve that controls the primary admission of fuel to the nozzle cannot be entirelyr closed or opened to an extent beyond'the range through which it may be properly adj usted.

A still further object of the invention is to provide a carbureter which has a fuel inlet nozzle which is chambered or enlarged between its restricted outlet and its narrow inlet so that an auxiliary reservoir is formed, this reservoir being adapted to fill when the throttle is closed or nearly so, so that the fuel in the nozzle is available in proper quantity for starting or accelerating urposes.

The invention also provi es an air valve which, when the suction is not excessive, directs the air drawn into the carbureter past the inlet nozzle, but which when moved by strong suction divides the air between the channel to the nozzle and an additional channel opened by the movement of the air valve. This insures a sufficient quantity of air and also cuts down the suction acting directly on the nozzle.

My improved carbureter also provides a means for closing the fuel supply while the throttle is open or in any other position, the closing ofi' of the fuel being particularly advantageous in an automobile engine when coasting the throttle, if open, permitting the passage of air through the engine so as to scavenge and also cool it.

The invention also consists in certain details of construction which are illustrated in the drawings hereunto attached, and described in this specification.

The invention is illustrated in the accompanying darwing` in which similar letters of reference indicate' corresponding parts in each of the views.

In said drawings Figure 1 is an end view of the carbureter with the top part of the casing broken away to show the throttle. Fig. 2 is a side view of the carbureter shown in Fig. 1, the casing` being broken away to show the fuel nozzle and the air valve. Fig. 3 is a top view of the carbureter shown in Fig. 1. Fig. 4 is a section on line 4-4 in Fig. 2. Fig. 5 is a perspective view of one part of the throttle stem. Fig. 6 is a perspective view of a valve and its connection with the stem shown in Fig. 5. Fig. 7 is a side View of a carbureter of modified. form.

The carbureter comprises a casing 10 which is provided with a conduit or passage 11 through which a current of air is drawn by the suction caused by the movement of the engine piston or any` other suitable means for drawing in the air. A source of fuel supply is provided, this being illustrated in the form shown as a float chamber 12 which has a normal fuel level 13, the level being maintained by a float 14 which operates certain valve mechanism common to carbureters and not shown in detail in this drawing. The valve mechanism referred to controls the admission of fuel to the float chamber through the inlet 15 which has a pipe connection 16 to receive a pipe which conducts the fuel from a tank or the like. Within the casing 10 is a valve casing 17 having a fuel inlet nozzle 18 preferably arranged vertically therein, the whole valve casing 17 having substantially the shape ofv an inverted T. A duct 19 connects the hollow interior of the valve casing 17 with the float chamber 12 below the fuel level and. the duct acts as a seat for the conical end 20 .of the needle valve 21, the stem of this needle valve passing through the valve casing 17 longitudinally of the alined ends of the T and having a screw-threaded portion 22 arranged in the stuffing box or boss 23, the end 24 of the stem projecting so that the stem can be manipulated. This needle valve controls what is commonly known as the high-speed gas, that is to say, it controls the maximum lamount of gasolene or other liquid fuel' fed from the lioat chamber to the valve casing of the fuel inlet nozzle. The possible range of movement of the needle valve 21 is comparatively limited in securing correct adjustment and such range may readily be comprised within a single complete rotation of such valve. In order to avoid extreme movement of the fuel valve, which would either open or close the valve to an extent not possibly within the range of correct adjustment, I place a stop adjacent to the stem so as to limit the longitudinal movement of the stem. In the drawing I show a stop 25 which is so placed that a projection, as the screw 26, on the disk or finger-piece 27, engages the stop on each side and the stem 21 is thus limited to less than a complete rotation. This prevents undue closing or opening of the duct 19 and still permits a limited adjustment of the stem 21. The screw 26 may also be used as a set-screw for holding the disk 27 in proper relation to the valve stem 24 when the same is properly given its initial setting.

The fuel inlet nozzle 18 has a comparatively restricted inner portion 28, beyond which there is, in the form shown, a countersunk portion 29, but other forms of outlet can be used so long as they are adapted to be controlled by suitable valve mechanism to regulate the supply of fuel that issues from the fuel inlet nozzle. In the outlet 29, when of the countersunk form shown, I arrange a valve 30 which is preferably tapered so as to lit therein, the valve 30 preferably' having a bead 31 so as to spread the fuel more thoroughly within the air passage of the casing. The valve 30 is operated from the' throttle valve and is usually arranged so that it is moved toward its closed position when the throttle is closed and vice versa, and so that it can also be adjusted in its position relative to said throttle, but this relation may be reversed, if desired, and it may also be arranged so that it can be moved independently of the throttle valve to close the fuel inlet nozzle when the throttle is o en.

pIn the form shown in Figs. 1, 2 and 3, the throttle is operated by a lever 32 which has means 33 on its ends by means of which it can be swung, the lever 32, if desired, having an extension 34 on the side opposite its pivot, whereby in case the carbureter is rel versed in its position, it is easily operated without additional attachments or mechanism. The lever 32 is preferably a twopart stem, the second part'37 being in line with the part 35 and arranged so that there is a gap or space 38 between them. The two parts of the stem, as shown, are connected by and in turn they serve to support a throttle 39 which is made in the usual form of a plate that can be swung inside the casing to open and close the passage therein, .the throttle being secured to the two parts of the stem by screws 40 or any other suitable' fastening means. Within a bore formed longitudinally of the stem 35 is a rod 41 which is rotatable in the stem and has a suitable handle 42 the form of handle shown being bent up from the stem 41, which is usually made of wire and formed into a spring loop 43 that bears against a` roughened or ratchet face 44 on the boss 45 of the throttle lever 32. Suitably disposed stops, as 46 and 47, are arranged to limit the swing of the handle or operating end 42 of the rod 41.

The rod 41 has a finger portion 48 which is made in the form of a crank or can be formed in any other manner so long as it has a throw, in other words, is eccentric to the rod 41. There is a connection between the valve 30 and the finger 48, the form shown being of simple type, the flat stem 49 of the valve 30 being bent into an eye 50, which eye fits over the finger 48. It will be evident from this construction that the adjustment of the handle 42 changes the position of the valve 30 relative to the throttle position and to the fuel inlet nozzle, thus causing a diierence in the supply of fuel at predetermined positions Aof the throttle, in other words, the adjustment may be such that the valve 30 is nearly shut when the throttle is closed, and it may open as the throttle is opened, and if the adjusting of the device is carried on far enough, when the throttle is closed the valve 30 may be opened somewhat when the throttle approaches the closed position, which is some- 115 times desirable as in throttling down a twocycle engine, andother adjustments giving various relations between the fuel inlet opening and the throttle opening required in practice, may be made. Suitable stops 51 120 and 52 are arranged on the boss of the lever 32, these stops being adapted t engage a wing or flange 53 so as to limi the move- `ment ofthe throttle and cause it to sto at its open and closed positions. It wil be 125 evident that other adjusting means and connections can be used in lieu of those illustrated in Figs. 1, 2 and 3.

When the handle 42 has been properly adjusted, for instance, to nearly close the 130 outlet 29 when the throttle is shut, and assuming that the throttle is opened, the valve 30 will be withdrawn somewhat from the countersunk outlet 29, although its movement is not sufficient to clear the outlet and it is guided, when it descends, by the countersunk outlet. When, with such adjustment, the throttle is operated by its lever 'toward its closed position, the connection 49, actuated by the finger 48, forces the valve 30 toward a closed position, and as the throttle is closed the fuel supply is decreased by reason of the valve 30 shutting off the supply of fuel.

Vhen the supply of fuel is diminished by the valve 30, the passage of fuel through the duct 19 continues, and in order to provide a ready supply when the valve is again opened, I provide a supplemental reservoir which may be accomplished by forming an enlarged chamber 54 in the valve casing 17 between the duct 19 and the nozzle 18, and the fuel, if not drawn off as rapidly as sup plied, will rise in the supplemental reservoir 54 to about the height indicated at 13, the fuel level in the float chamber. When the valve 30 is again opened, the fuel in the supplemental reservoir is at a level close up to or within the nozzle 18, and a ready and quick supply of fuel is assured, but as only so much as can pass the valve 30 is supplied, any choking tendency, due to over richness of the mixture, is avoided.

On tle'lwer part of the valve casing 17 I provide a boss 55 from which depends a stem 56. An air-receiving chamber 57 may be arranged to be held on the stem by means of a nut 58 or other fastening means, the air-receiving chamber usually being provided at the inlet portion 59 with a butterfly valve 60 operated by levers 61 and normally held open by a spring 62, this valve being common on carbureters and being used to shut off or cut down the air supply when starting the engine.

Mounted to slide on the stem 56 is an. air valve which has a ring portion 59 adapted to be slidably received within the throat 6()al of the casing 10 directly below an enlarged portion 61 which forms a chamber 62. The inside of the ring portion 59 fits around a tube 63 preferably of Venturi form which encircles the nozzle 18 and is also spaced away from the sides of the air passage so as to provide a channel 64. The valve casing 17 passes through the enlarged lower portion of the tube 63, which, if desired, may be made in two parts secured together and to the casing 17 as by solder or the like. On the lower part of the air valve is a collar 65 which normally rests on the bottom of the air-receiving chamber 57 and may slide on the stem 56 which is received within the central opening of the collar 65. The collar 65 and the ring portion 59 are connected by ribs 66 or other suitable connections which provide spaces or perforations between. them, whereby the air can pass to the inside of the ring. It will be evident that as the speed of the engine increases, and the `velocity of the air passing through the carbureter correspondingly increases, the air valve will be lifted by the suction and the air which previously was guided through .the openings 67 between the ribs 66 will be divided, and while some of it will still pass up through the tube or thimble 63, a considerable quantity of air will pass around the ring 59, which is lifted up within the chamber 62, and up through the channel 64, and the suction on the fuel inlet nozzle will be reduced. The air valve is returned to its normal position by gravity when the suction is reduced.

In Fig. 7 I show a modified form. The throttle level' 32 is provided with a boss 45. The rod 41 corresponding to rod 41 has seL cured thereto a lever having arms 68 and 72, the arm 68 abutting against a regulating screw 69 mounted in the threaded opening 70 on the boss 45', such regulating screw 69 operating to overcome the tension of a spring 71 attached tothe lever arm 68. This arrangement serves to adjust the relative positions of the valve 3() and the throttle in the 'manner and with the advantages already described. In addition to making such adjusting arrangement, however, I provide means for moving the lever secured to the cranked rod 41irrespective of the position of the lever 32, and so that, no matter what position is occupied by the throttle lever 32 and the throttle attached, the rod 41 may be rotated to close the valve 30 to shut off all the fuel supply. This is particularly adaantageous in a carbureter for an automobile engine when coasting and allows the closing of the fuel outlet even when the throttle is open, thus permitting the passage of pure air through the engine, both for savenging purposes and also to assist in cooling the engine.

One form of operating the rod 41 through the lever arm 72 is shown in Fig. 7 and comprises an arm 73 pivoted at 74 and normally held by a spring 75 against a stop 76. The arm 77 is operated by any suitable means, such as a strand 78, so as to swing the arm 73 to move the lever 72. This movement can be limited so that when the valve 30 is shut, the arm 73 is in engagement with a suitable stop 79. Other means of operating the lever 72 can be employed.

It will be evident that changes can be made in the details of the construction without departing from the scope of the invention.

.Another feature of the invention to which attention is called is the construction of the air passage in the neighborhood of the Venturi tube. The walls of the passage are so nozzle, a valve for Varying the size of the outlet of the nozzle, a connection within the passage and serving to connect the throttle valve and the nozzle valve so that they move in unison, and means for adjusting the relative positions of the throttle valve and the nozzle valve.

2. ln a carbureter, a casing having a substantially straight conduit through which a current of air is drawn, a fuel inlet nozzle in said conduit, a butterfly throttle valve arranged to turn on an axls extending across' said air conduit and in the path of the, fuel from the nozzle, a valve for varying the opening of the nozzle, adjustable interconnecting means between the throttle valve and the nozzle valve arranged within the conduit, and means extending to the exterior of the carbureter for adjusting said interconnecting means.

3. In a carbureter, a casinghaving a substantially straight conduit through which a current of air is drawn, a fuel inlet nozzle in said conduit, a butterfiy throttle valve arranged to turn on an axis extending across said air conduit and in the ath of thefuel from the nozzle, a valve or varying the opening of the nozzle, adjustable interconnecting means between the throttle valve and the nozzle valve arranged' within the conduit, and means extending to the exterior of the carbureter through the axis of the throttle for adjusting said interconnecting means.

4. In a carburetor, a casing having a passage therein, a fuel inlet nozzle in the passage, a two-part stem in said casing, a throttle secured to the 'adjacent parts of the stem, an eccentrically arran ed member disposed between the parts of 51e stem, and a valve for the nozzle and operated from the mem ber.

5. In a carbureter, a casing with an air passage therein, a fuel inlet nozzle in the passage, a two-piece stem in the casing, a throttle in the passage and secured to the two parts of the stem, the parts having a space between them, a rod rotatable in one of the parts of the stem, an eccentrically mounted finger on the rod and in the space between the parts of the stem, a valve in the outlet of the nozzle, and a connection between the finger and the valve.

6. In a carburetor, a casing with an air passage therein, a fuel inlet nozzle in the passage, a two-piece. stem in the casing, a throttle in the passage and secured to the two parts of the stem, the parts having a space between them, a rod rotatable in one of the parts of the stem, an eccentrically mounted linger on the rod and in the space between the parts of the stem, means on the outer end of the rod for adjustably securing the rod and stem in diii'erent positions relative to each other, a valve to vary the outlet of the nozzle, and a connection between the valve and the finger.

7. In a carbureter, a casing with an air passage therein, a fuel inlet nozzle in the passage, a two-piece stem in the casing, a throttle in the passage and secured to the two parts of the stem, the parts having a space between them, a rod rotatable in one o the parts of the stem, an eccentrically mounted finger on the rod and in the space between the arts of the stem, means on the outer end ofpthe part,of the stem containing the rod for turning the stem, coacting means on the turning means and the rod for holding them in different rotative positions relative to each other, and a valve operated from the linger, the valve regulating the outlet of the nozzle.

8. In a carbureter, a casing having a sub- ,stantially straight air passage, a fuel nozzle in said passage, a valve for said nozzle, a butterfly throttle valve extending across said passage and comprising a rotatable stem, and means disposed partially within said stem for moving said valve.

9. In a carbureter, a casing provided with a substantially straight air conduit, a fuel nozzle in said conduit, a valve for said nozzle, a butteriy throttle valve extending across said conduit and comprising a rotatable stem, and means disposed partially within said stem at its axis for moving said valve.

10. In-a carbureter, acasing having a substantiall straight air conduit, a fuel nozzle in sald conduit, a valve for said nozzle, a butterfly throttle valve extending across said conduit and comprising a hollqw rotatable stem, and means within said conduit and comprising a member extending partially through said stem and projecting beyond its end, and means for adjusting Said projecting member with re- ,spect to said stem,

11. In a earbureter, a casing provided with an air conduit, a fuel inlet nozzle in said conduit, a thimble to direct incoming air past the nozzle, the conduit having an enlarged portion and a restricted portion on the iniet side of the nozzle, a stem arranged in the conduit, an air valve comprising a collar sliding on the stem, a ring portion slidably received on the thimble, and a conneetion between the collar and the ring arranged to direct the passage of air between them, the air valve when drawn `diy suction into the enlarged portion of the conduit permitting the passage ofair around the ring and thimble, and the ring portion of said valve normally iitting said restricted portion of said conduit. i

12. 'In a carbureter, a Casing having a vertical air passage, a fuel inlet nozzle vertically arranged inthe passage, the passage being enlarged below the fuel inlet, a thimble surrounding the nozzle and leaving an annularpassage therebetween and also providing a space between the thimble and the walls of the passage, an air valve in said passage, the valve comprising a ring surrounding the thimble and normally in engagement with the walls of the passage below its enlarged portion, a collar connected to the ring by means of a perforated portion to permit the passage of air between the collar and the ring, the collar being designed to provide weight to the valve and to be separatedy from the walls of the passage, whereby air can be directed around the collar inside of the ring and inside of the thmble so as to pass the outlet of the nozzle, said valve being adapted to be lifted from said normal position by increased suction.

In testimony that I claim the foregoing, I

WILLIAM M. SNYDER.

Witnesses:

WM. H. CAMFIELD, M. A. JOHNSON.

in the conduit, an air valve comprising a collar sliding on the stem, a ring portion slidably received on the thimble, and a connection between the collar andthe ring arranged to direct the passage of air between them, the air valve when drawnby suction into the enlarged portion of the conduit permitting the passage ofr air around the ring and thimble, and the ring portion of said valve normally fitting said restricted portion of said conduit. y

12. In a carbureter, a casing -havi-ng a vertical 'air passage, a fuel inlet nozzle vertically arranged inthe passage, the passage being enlarged below the fuel inlet, a thimbleY surrounding the nozzle and leaving an annularpassage therebetween and also providing a space between the thimble and the walls of the passage, an air valve 1n said passage, the valve comprising a ring surrounding the thimble and normally in en- 1916, upon quiring correction as follows:

Words or butterfly valve;

correction therein Patent Oce.

It is hereby certified that in Letters Patent N o. 1,197,407,

gagement with the walls of the passage below its enlarged portion, a collar connected to the ring by means of a perforated portion to permit the passage of air between the collar and the ring, the collar being designed to provide weight to the valve and to be 'separatedf from the walls of the passage, whereby air can be directed around the collar inside of the ring and inside of the thimble so as to pass the outlet of the nozzle, 4said valve being adapted to be lifted from said normal position by increased suetion.

In testimony that I cla-im the foregoing, I have hereunto set my hand, this 25th day of May, 1914.

WILLIAM M. SNYDER.

Witnesses:

IVM. H. CAMFIELD, l M. A. JOHNSON.

granted September 5,

`the application ofY William Snyder, of Newark, New Jersey, for an improvement in Carbureters, an error appears in the printed specification re-l Page 2,- linel 7, after the Word plate insert the and that the said Letters Patent should be-read with this Signed and sealed this 26th'day of September, A. D., 1916.

F. W. H. CLAY,

Acting, Commissioner of Patents.

that the same may conform to the record of the case in thel Correction n Letters Patent No. 1,197,407.

It is hereby certiied that in Letters Patent No. 1,197,407, granted September 5, 1916, upon the application of William Snyder, of Newark, New Jersey, for an improvement in Carbureters, an error appears in the printed specification requiring correction as follows: Page 2,v line 77, after the word plate insert the words or butterfly valve; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 26th day of September, A. D., 1916.

(SEAL.) F. W. H. CLAY,

Acting Commissioner of Patents. C1. 48155.1. 

